Bug 215798
| Summary: | kprobe installed on scheduler_tick causes crash | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 4 | Reporter: | William Cohen <wcohen> |
| Component: | kernel | Assignee: | Linda Wang <lwang> |
| Status: | CLOSED WORKSFORME | QA Contact: | Brian Brock <bbrock> |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | 4.4 | CC: | fche, jbaron |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | i386 | ||
| OS: | Linux | ||
| URL: | http://sources.redhat.com/bugzilla/show_bug.cgi?id=2726 | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2007-03-29 18:04:37 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
Jason, this appears to be not a kprobe bug, but a latent bug in the exception fixup code that just happens to be triggered by kprobes. I can no longer reproduce this bug on 2.4.9-44.EL. |
From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.7.13) Gecko/20060418 Fedora/1.0.8-1.1.fc4 Firefox/1.0.8 Description of problem: The simple empty systemtap probe on scheduler_tick cause the kernel RHEL4U4 kernel to crash: #stap -v -e 'probe kernel.function("scheduler_tick") {}' There was a suggestion by Chuck Ebbert to fix this problem. http://lkml.org/lkml/2006/6/19/106 The question is Ebbert's suggestions a reasonable fix to the problem? Version-Release number of selected component (if applicable): kernel-2.6.9-42.0.3.EL, How reproducible: Always Steps to Reproduce: 1. Install the needed kernel-debuginfo, kernel-devel, and sysetmtap 2. As root run: stap -v -e 'probe kernel.function("scheduler_tick") {}' Actual Results: Machine crashes with following messages on console: Linux slingshot.devel.redhat.com 2.6.9-37.EL #1 Fri May 19 17:55:44 EDT 2006 i686 athlon i386 GNU/Linux Kernel panic - not sync: kernel/module.c:2114: spin_lock(kernel/module.c:c036b280) already locked by kernel/module.c:2114 Badness in panic at kernel/panic.c:118 Expected Results: Probe runs until user hits control-c. No crash. Additional info: